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lim an = lim ((2n^3+n-2)^1/3)/(n+1)
n->inf n-> inf
si dividimos todo entre n
lim (((2n^3+n-2)^1/3)n)/((n+1)/n)
n->inf
introducimos n a la raiz seria n^3
lim (((2n^3+n-2)/n^3)^1/3)/(1+1/n)
n->inf
separamos la fracción
lim ((2+1/n^2-2/n^3)^1/3)/(1+1/n)
n->inf
evaluamos como a/inf =0 entonces;
lim an = (2)^1/3
n->inf
raiz cubica de 2